Corrosion on pingers ?
If it's corrosion on the pingers, it is probably galvanic corrosion ( occurs between metals of different potentials in seawater).
But since the waranty ends after 30 days at sea, I don't think the designers cared about this.
Last edited by DJ77; 4th May 2011 at 17:11.
Reason: Ooops, BJ-ENG fired first.